A lot of these skills generalize way beyond the immediate problem. I don't have a "fix the faucet" skill, I don't even think in these terms - more in terms of "operate wrench", "operate set of screwdrivers", "understand how water faucet works", "understand how plumbing works" (at high level), and these skills let me diagnose and fix many problems myself, most of them not even related to water faucet. Etc.

Other considerations:

- Sometimes you need a solution NOW. Household infra tends to break down on Saturdays and Sundays a lot for some reason.

- Sometimes it's not even about efficiency. Like, we got ourselves an allotment garden recently. Per your $100/hr vs. $30/hr math, I could and should just hire a bunch of contractors to clean it up and set it up for us. But for me, this defeats the point of getting that garden in the first place.

- Some work is too small for a contractor with necessary skills to come, unless you let them bill you for 10x the work. I had to learn how to patch holes in ceiling myself, because the price for getting the 4m x 5cm hole fixed was the same as for renovating the whole ceiling.

EDIT:

Also what 'lotsofpulp said - sometimes you want the outcome to have a very particular shape or quality level, and to guarantee it, you'd need to micromanage the contractor so badly, that in many cases it's easier to do it yourself.

There is a lot of your time involved in hiring someone else even if not active labor. And potentially stress in finding a contractor who will do a good job and the right job.

Doing it yourself can be rewarding and potentially much quicker. Why not do it yourself if you're able ( and assuming its not one of those things a pro could do in 1/10th the time).

Finding someone who will take your money is easy. Finding that they can actually be trusted to do the work correctly, on budget and on a compatible schedule may or may not take more time than actually doing the thing itself.

Also, if you do not bother to learn at all, you have no way to verify that the work is actually done correctly. People will absolutely take advantage of your ignorance.

You'll typically need to wait at home for the contractor to arrive, and while he's working. Unless you can work while you're doing that, that's $100/hr lost for that time, in addition to what you're paying the contractor.

Unless you have a spouse or partner at home who can be there, but then you're losing whatever they could have been earning if they were working instead.

You have to make the extra $100 per hour to pay the $30. So the employer has to agree to hire you for more hours. Don't forget you have to find unpaid time to find a person who would do the job.

It depends on the volatility of outcomes of paying $30 per hour for someone else to do something.

I like to do things myself or learn how to when I cannot sufficiently predict the quality of the service I will get or if the damage can be too great.

If you are capable of doing it yourself, but choose to hire somebody else to do it, then you are not dependent. If you are not capable of doing it yourself and must have somebody else do it for you, then you are dependent.

A lot of things have no total ordering, independence level including. If a person A can unclog the sink and person B can trim the hedges, they are not comparable to each other; however both of them are less independent that person C who can do both.

This ordering requires defining the scope, and the narrower the scope, the easier it is to compare people. If you only look at "maintain the rented city apartment" and "live in rural house" in isolation, it's pretty easy to rank people by independence. But if you say that _either_ of those counts as "independence", the things get much harder to qualify. But either way, there will be people who can't do anything, people who can do everything, and a large mass of "uncomparable" people in the middle.

OK, I love this questions. For me, the hedges I could ignore for quite a few months. But I want the darn sink unclogged immediately. Which, I guess, is why I've made quite a mess a time or two.

Depends on the place and how expensive is the plumber. Around where I live, cutting bushes can be very expensive and so are plumbers. It all depends on the amount of labor and cost per hour.. Both are expensive.